Slow kinetics and instability seriously hinder the development of MnO2 cathodes for aqueous Zn-ion batteries. Herein, an emerging 2D material MoB-based MBene was used as the MnO2 matrix. Benefiting from the high electrical conductivity and outstanding stability of MoB, the prepared MoB/MnO2 composite cathode effectively alleviated the above issues and showed significant electrochemical performance improvement.